pro-docs/libs/npm/docsify-sidebar-collapse.min.css

.sidebar-nav li {
    position: relative;
    margin: 0;
    cursor: pointer
}
.sidebar-nav li i.plus {
    width: 20px;
    height: 20px;
    display: inline-block;
    background-image: var(--sidebar-nav-pagelink-background-image);
    background-position: var(--sidebar-nav-pagelink-background-position);
    background-repeat: no-repeat;
    vertical-align: -4px;
}

.sidebar-nav li :has(+ a){
    display: none !important;
}

/* .sidebar-nav li.folder::before {
    content: '';
    display: block;
    position: absolute;
    top: 11px;
    left: -12px;
    height: 6px;
    width: 6px;
    border-right: 1px solid #505d6b;
    border-bottom: 1px solid #505d6b;
    transform: rotate(-45deg);
    transition: transform .1s
}

.sidebar-nav li.open::before {
    transform: rotate(45deg)
}

.sidebar-nav li.collapse::before {
    transform: rotate(-45deg)
} */